Giulietti S-9 - Guitar preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The S-9 is a valve amplifier sold under the Giulietti name, a brand known for accordions. It has a Guitar channel and an Accordion channel (accordion and instrument inputs), each on a 12AX7, own volume and tone. A 6C4 drives a spring reverb, recovered by 12AU7A stages, and a 12AX7 runs the tremolo with a speed control; both have footswitches. A 12AU7A long-tail inverter drives a fixed-bias push-pull pair of 7591A tubes on a 5AR4 rectifier.

• Wattage: 35W
• Channels: 2
• Preamp tubes: 3× 12AX7, 1× 6C4, 2× 12AU7A
• Power tubes: 2× 7591A

Tags: vintage, two-channel.

Schematic-derived preset files for 16 Fractal and Line 6 modelers: Axe-Fx II/XL/XL+, Axe-Fx III, FM3, FM9, and the full Helix family (Floor, LT, Rack, HX Stomp, HX Stomp XL, Native).

Gridleak extracts amp parameters from original circuit schematics using AI vision — component values, gain staging, tone stack topology, tube types — then generates native preset files for every supported modeler. Every extraction is scored 0–100 and the score is published.